US9648601B2 - Communication method, base station and user equipment using a set of legacy or aggressive CQI table and legacy or aggressive MCS table - Google Patents

Communication method, base station and user equipment using a set of legacy or aggressive CQI table and legacy or aggressive MCS table Download PDF

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US9648601B2
US9648601B2 US14/416,174 US201214416174A US9648601B2 US 9648601 B2 US9648601 B2 US 9648601B2 US 201214416174 A US201214416174 A US 201214416174A US 9648601 B2 US9648601 B2 US 9648601B2
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cqi
mcs
parameter table
legacy
aggressive
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US20150163773A1 (en
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Lilei Wang
Ming Xu
Masayuki Hoshino
Akihiko Nishio
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Sun Patent Trust Inc
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    • H04W72/042—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/003—Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
    • H04L1/0035—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter evaluation of received explicit signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present disclosure relates to parameter table configuration technique in the communication field.
  • CQI Channel Quality Indicator
  • CSI channel state information
  • FIG. 1 shows the CQI table in TS 36.213.
  • the standard CQI table which may also be referred to as a legacy CQI table, includes 16 entries with indices from 0-15, corresponding to modulation schemes such as QPSK, 16QAM and 64QAM. Therefore, 4 bits are necessary to reflect a certain entry when the UE feedbacks a certain wideband CQI to the eNB.
  • FIG. 2 shows the subband differential CQI table in TS 36.213. It can be seen that the standard subband differential CQI table, which may also be referred to as a legacy subband differential CQI table, includes 4 entries with indices from 0 to 3. Therefore, UE needs 2 additional bits to feedback the subband differential CQI offset level.
  • the standard subband differential CQI table which may also be referred to as a legacy subband differential CQI table, includes 4 entries with indices from 0 to 3. Therefore, UE needs 2 additional bits to feedback the subband differential CQI offset level.
  • Modulation Coding Scheme is an important communication parameter in 3GPP Rel.8/9/10 system.
  • MCS refers to which combination of modulation order and coding rate is used in physical transmission of downlink and uplink.
  • MCS table restricts which combination of modulation order and transport block size could be used.
  • FIG. 3 shows the MCS table in TS 36.213.
  • the standard MCS table which may also be referred to as a legacy MCS table, includes 32 entries with indices from 0-31, corresponding to modulation orders such as 2, 4 and 6. The last three entries with indices 29-31 are used for re-transmission.
  • 3GPP which MCS is used is informed in Downlink Control Information (DCI). And 5 bits are necessary for this indication.
  • DCI Downlink Control Information
  • the parameter table such as the CQI table or the MCS table described above, so that more entries corresponding to higher modulation orders and/or coding rates than those in the legacy tables can be indicated.
  • the differential CQI table to indicate more CQI offset levels, so that the indication of the differential CQI can be more accurate.
  • a communication method of configuring a parameter table in a wireless communication system including a base station and a user equipment comprising: defining at both the base station and the user equipment a parameter table which includes whole entries of a legacy parameter table and extended entries; and transmitting from the base station to the user equipment a bitmap indication which indicates a sub-table selected from the parameter table.
  • a communication method of configuring a parameter table in a wireless communication system including a base station and a user equipment comprising: defining at both the base station and the user equipment multiple parameter tables which include at least a legacy parameter table and an aggressive parameter table which includes new modulation order related entries or new combinations of modulation order and coding rate; and transmitting from the base station to the user equipment an indication which indicates a parameter table selected from the multiple parameter tables, wherein the number of entries in any one of the multiple parameter tables is the same as in the legacy parameter table to keep signaling overhead unchanged.
  • a communication method of configuring a parameter table in a wireless communication system including a base station and a user equipment comprising: defining at both the base station and the user equipment a parameter table which includes whole entries of a legacy parameter table and extended entries; and transmitting from the base station to the user equipment an indication which indicates one entry of the parameter table, by legacy bits and at least one unused bit jointly.
  • a communication method of configuring a parameter table in a wireless communication system including a base station and a user equipment comprising: defining at both the base station and the user equipment a parameter table which includes whole entries of a legacy parameter table and extended entries; and transmitting from the base station to the user equipment an indication which indicates one entry of the parameter table by a number of bits, wherein the number of bits corresponds to the number of entries in the parameter table.
  • a base station for configuring a parameter table in a wireless communication system including the base station and a user equipment, comprising: a storing unit which stores a pre-defined parameter table including whole entries of a legacy parameter table and extended entries; and a transmitting unit which transmits to the user equipment a bitmap indication which indicates a sub-table selected from the pre-defined parameter table, wherein the number of the entries in the subtable is the same as in the legacy parameter table.
  • a user equipment for configuring a parameter table in a wireless communication system including a base station and the user equipment, comprising: a storing unit which stores a pre-defined parameter table including whole entries of a legacy parameter table and extended entries; and a receiving unit which receives from the base station a bitmap indication which indicates a sub-table selected from the pre-defined parameter table, wherein the number of the entries in the subtable is the same as in the legacy parameter table.
  • a communication method of configuring different CQI tables for different CQI types considering wideband CQI is explicitely indicated by CQI table but other CQI type like spatial CQI, subband CQI or UE-selected CQI is implicitly indicated by subband differential CQI table.
  • a communication method of configuring new parameter table in a wireless communication system including a base station and the user equipment, in which there is no half closed-interval definition for offset levels. Instead, only values have been defined in the table and the indicated values based on bitmap form the full closed-interval table automatically.
  • more entries than those in the legacy tables can be indicated.
  • higher modulation orders can be supported to adapt channel and improve spectral efficiency but without increasing the reported overhead.
  • FIG. 1 is a diagram showing the legacy CQI table in the conventional communication system
  • FIG. 2 is a diagram showing the legacy subband differential CQI table in the conventional communication system
  • FIG. 3 is a diagram showing the legacy MCS table in the conventional communication system
  • FIG. 4 is a diagram schematically showing communication scenarios where UE has different modulation/coding rate requirements at different positions;
  • FIG. 5 is a diagram schematically showing communication scenarios where different carrier components (CCs) have different modulation/coding rate requirements;
  • FIG. 6 is a diagram schematically showing communication scenarios where different links have different modulation/coding rate requirements
  • FIG. 7 is a flowchart showing an exemplary implementation of a communication method according to a first embodiment of the present disclosure
  • FIG. 8 is a diagram schematically showing an extended CQI table and corresponding bitmap examples according to the first embodiment of the present disclosure
  • FIGS. 9 a and 9 b are diagrams schematically showing two kinds of extended differential CQI tables and corresponding bitmap examples according to the first embodiment of the present disclosure
  • FIGS. 10 a and 10 b are diagrams schematically showing two kinds of extended MCS tables based on positions of reserved entries and corresponding bitmap examples according to the first embodiment of the present disclosure
  • FIG. 11 is a diagram schematically showing the configuration of a base station according to the first embodiment of the present disclosure.
  • FIG. 12 is a diagram schematically showing the configuration of a user equipment according to the first embodiment of the present disclosure.
  • FIG. 13 is a flowchart showing an exemplary implementation of a communication method according to a second embodiment of the present disclosure
  • FIG. 14 is a diagram schematically showing a legacy parameter table and an aggressive parameter table according to the second embodiment of the present disclosure
  • FIG. 15 is a diagram schematically showing the configuration of a base station according to the second embodiment of the present disclosure.
  • FIG. 16 is a diagram schematically showing the configuration of a user equipment according to the second embodiment of the present disclosure.
  • FIG. 17 is a flowchart showing an exemplary implementation of a communication method according to a third embodiment of the present disclosure.
  • FIG. 18 is a flowchart showing an exemplary implementation of a communication method according to a fourth embodiment of the present disclosure.
  • FIG. 19 is a diagram schematically showing a new transmission format according to the fourth embodiment of the present disclosure.
  • a communication method of configuring a parameter table in a wireless communication system including an eNode B and a UE is provided in the first embodiment of the present disclosure.
  • the communication method comprises the steps of: defining at both the eNode B and the UE a parameter table which includes whole entries of a legacy parameter table and extended entries; and transmitting from the eNode B to the UE a bitmap indication which indicates a sub-table selected from the parameter table, wherein the number of the entries in the sub-table is the same as in the legacy parameter table.
  • FIG. 4 is a diagram schematically showing communication scenarios where UE has different modulation/coding rate requirements at different positions.
  • UE 401 is in a local area or massive multiple-input-multiple-output (MIMO) scenario 400 . It is found that UE 401 may have different requirements on modulation order/coding rate at different positions. For example, UE 401 will experience different signal-to-noise ratio (SINR) conditions when it is at different positions. Specially, if UE 401 is moving slowly from cell edge (e.g. position A) to a position (e.g. position B) closer to the cell center, and finally to the cell center (e.g. position C), it will experience low SINR, medium-high SINR and very high SINR conditions, respectively. Obviously, low SINR area needs a relatively lower effective coding rate, while high SINR area needs a relatively high effective coding rate.
  • SINR signal-to-noise ratio
  • FIG. 5 is a diagram schematically showing communication scenarios where different carrier components (CCs) have different modulation/coding rate requirement.
  • CCs carrier components
  • CA carrier aggregation
  • different CCs may also have different modulation/coding rate requirements due to different SINR/interference/channel conditions.
  • a conservative CQI table e.g. the legacy CQI table
  • an aggressive CQI table for boosting throughput.
  • FIG. 6 is a diagram schematically showing communication scenarios where different links have different modulation/coding rate requirement.
  • uplink and downlink may have different modulation/coding rate requirements due to different SINR/interference/channel conditions.
  • a conservative CQI table e.g. the legacy CQI table
  • an aggressive CQI table due to less uplink traffic, and hence high SINR.
  • the communication method according to the first embodiment of the present disclosure is designed in view of the above analysis, in order to meet different modulation/coding rate requirements.
  • FIG. 7 is a flowchart showing an exemplary implementation of the communication method according to the first embodiment of the present disclosure.
  • the communication method according to the first embodiment is used for configuring a parameter table in a wireless communication system including an eNode B and a UE.
  • the communication method starts at step 701 , where a parameter table is defined at both the eNode B and the UE.
  • the parameter may be various communication parameters communicated between UE and eNode B.
  • the parameter may be CQI, differential CQI offset level and/or MCS.
  • the parameter table may be a CQI table, a differential CQI table or a MCS table.
  • the parameter table may include the whole entries of a legacy parameter table and some extended entries.
  • the entries of the legacy parameter table may be standard entries defined in standards such as 3GPP TS 36.213, and they may correspond to communication scenarios where relatively conservative modulation orders/coding rates are required.
  • the extended entries may be extended entries defined according to the first embodiment of the present disclosure, and they may correspond to communication scenarios where relatively aggressive modulation orders/coding rates are required.
  • the eNode B transmits to the UE a bitmap indication which indicates a sub-table selected from the parameter table.
  • the bitmap indication may be transmitted by the eNode B to the UE via a signaling in the upper layer or in the physical layer.
  • the bitmap indication may be transmitted via the Radio Resource Control (RRC) signaling semi-statically or implicitly triggered via bits in Downlink Control Information (DCI) format dynamically (specific configurations are via RRC signaling).
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • the bitmap may be used for indicating the sub-table selected from the parameter table. It should be noted that the number of the entries in the sub-table is the same as in the legacy parameter table, so that the signaling overhead related to the indication in the physical layer is kept unchanged.
  • the bitmap may be generated by the eNode B based on the communication scenarios of the wireless communication system as described above typically or any other suitable scenarios.
  • both the eNode B and the UE are aware of the sub-table currently in use, so they may communicate an index of an entry in the parameter sub-table with each other.
  • UE may report the CQI index to the eNode B based on the sub-table and eNB clearly know the exactly same table where UE is referring to.
  • the eNode B may inform the UE of the MCS index and UE assumes the same MCS table as that in eNB.
  • the method of the first embodiment of the present disclosure may further comprise a re-indexing process and a restoring process, which will be described later, to keep the feedback bits unchanged.
  • FIG. 8 is a diagram schematically showing an extended CQI table and corresponding bitmap examples according to the first embodiment of the present disclosure.
  • the CQI table as shown in FIG. 8 which may also be referred to as the extended CQI table, includes 27 entries with indices from 0-26. Each entry corresponds to a certain CQI value with a corresponding modulation order and coding rate. It should be noted that the values of the entries and the number of the entries in the extended CQI table are only examples, and are not limited thereto.
  • the extended CQI table includes the whole entries with indices from 0-15 of the legacy CQI table, and new extended entries with indices from 16-26.
  • the number of the entries in the extended CQI table is more than that in the legacy CQI table.
  • the method according to the first embodiment of the present disclosure may configure a sub-table (a conservative CQI table in this case) selected from the extended CQI table, with a bitmap as shown in column 801 of FIG. 8 .
  • the value of “1” in the corresponding position of the bitmap may indicate, for example, the existence of the corresponding entry in the sub-table; while the value of “0” in the corresponding position of the bitmap may indicate, for example, the absence of the corresponding entry in the sub-table; or vice versa. It can be seen from the bitmap 801 that entries with lower effective coding rates and modulation orders (e.g., QPSK, 16QAM and 64QAM) are configured in this case.
  • entries with lower effective coding rates and modulation orders e.g., QPSK, 16QAM and 64QAM
  • the method according to the first embodiment of the present disclosure may configure a sub-table (a medium CQI table in this case) selected from the extended CQI table, with a bitmap as shown in column 802 of FIG. 8 . It can be seen from the bitmap 802 that entries with medium effective coding rates and modulation orders are configured in this case.
  • the method according to the first embodiment of the present disclosure may configure a sub-table (an aggressive CQI table in this case) selected from the extended CQI table, with a bitmap as shown in column 803 of FIG. 8 . It can be seen from the bitmap 803 that more entries with higher effective coding rates and modulation orders, for example, 256QAM, are configured in this case. Also, a few entries with lower effective coding rates and modulation orders (e.g., QPSK) are configured to accommodate occasional cases.
  • a sub-table an aggressive CQI table in this case
  • bitmaps 801 - 803 are only examples, and those skilled in the art can configure the CQI table with different bitmaps according to the communication scenario.
  • UE should re-order (re-index) the entries in the sub-table so that the index length is still the same as legacy CQI table.
  • eNB it may restore the received index to the original index according to the bitmap.
  • UE chooses CQI index 20 based on restriction of bitmap 2. Then, UE may re-index the original entries in the sub-table indicated by the bitmap 2, and the original index 20 will be changed to a new index 15 which will be feedback to eNB. eNB will restore the index 15 into the original index 20 based on the bitmap 2. So there is no ambiguity between eNB and UE. eNB always knows what kind of table UE is using currently based on the bitmap based configuration.
  • the bitmap indication may be transmitted by the eNode B to the UE via an upper layer signaling, such as the RRC signaling, which keeps the signaling overhead in the physical layer unchanged.
  • an upper layer signaling such as the RRC signaling
  • the number of entries in the CQI sub-table is 16, which is the same as that in the legacy CQI table, so that a good backward compatibility and overhead is ensured and only a small modification to the standard is needed.
  • FIGS. 9 a and 9 b are diagrams schematically showing two kinds of extended differential CQI tables and corresponding bitmap examples according to the first embodiment of the present disclosure.
  • the extended differential CQI table 901 includes the whole entries with indices from 0-3 of the legacy differential CQI table as shown in FIG. 2 , and new extended entries with indices from 4-7.
  • the values of the entries and the number of the entries in the extended differential CQI table are only examples, and those skilled in the art may design an extended differential CQI table comprising more or less number of entries with different values.
  • the option shown in FIG. 9 a is direct extension and still keeps the legacy entries/values.
  • the method according to the first embodiment may configure a sub-table selected from the extended differential CQI table, with the bitmap 1 as shown in column 902 of FIG. 9 a , which indicates the same entries as those in the legacy differential CQI table.
  • the method according to the first embodiment may configure a sub-table selected from the extended differential CQI table, with the bitmap 2 as shown in column 903 of FIG. 9 a , which indicates extended entries corresponding to large offset levels.
  • FIG. 9 b is a differential CQI table completely redefined according to the first embodiment of the present disclosure, which includes entries totally different from those in the legacy differential CQI table.
  • no half-closed intervals as in the legacy differential CQI table have been defined. Instead, only some values have been defined. After indication of selected entries via bitmap, those values form closed-set automatically.
  • the method according to the first embodiment may configure a sub-table as shown in sub-table 908 , with the bitmap 1 as shown in column 905 .
  • the method according to the first embodiment may also configure a sub-table as shown in sub-table 907 , with the bitmap 2 as shown in column 906 .
  • the advantage of the extended differential CQI table like FIG. 9 b is that it may be easier to further extend the differential CQI table to include more entries. In other words, it achieves a good forward compatibility, since only some new values instead of half-closed intervals are needed to be defined.
  • wideband CQI and subband/spatial/UE selected CQI do not need to use the same CQI table in the above descriptions. That is, the selection of a wideband CQI entry may be restricted to the CQI sub-table to keep overhead unchanged, but the selection of a subband/spatial/UE selected CQI entry may not be restricted to the CQI sub-table and may be based on the whole extended CQI table. That is because the subband/spatial/UE selected CQI is indirectly reflected by a differential CQI offset level, instead of directly reflected by a real CQI value as described above.
  • the index of a subband differential CQI entry can be determined based on a CQI sub-table selected from an extended CQI table by the bitmap.
  • the index of the subband differential CQI entry can be determined based on the whole extended CQI table.
  • a wideband CQI may be restricted by bitmap 2 as shown in FIG. 8 , and UE feedbacks a CQI index 16.
  • the wideband CQI is determined based on a CQI sub-table selected from the extended CQI table by bitmap.
  • the spatial CQI, the subband CQI or the UE-selected CQI is to be determined based on the following: (1) Wideband CQI, which is based on the extended CQI table, or the CQI sub-table selected from the extended CQI table; and (2) a differential CQI offset level based on sub-table, which is selected from the extended differential CQI offset level table by bitmap.
  • a re-indexing and restoring process may be applied for the extended CQI table as described above. But for the differential CQI table, the re-indexing and restoring process may not be necessary. For example, if UE chooses CQI index 20 for wideband CQI and index 22 for subband CQI, then only the index 2 (based on differential CQI table) should be feedback.
  • the feedback accuracy of differential CQI may be improved without an increase of signaling overhead.
  • FIGS. 10 a and 10 b are diagrams schematically showing two kinds of extended MCS tables and corresponding bitmap examples according to the first embodiment of the present disclosure.
  • the extended MCS table as shown in FIGS. 10 a and 10 b includes 42 entries with indices from 0-41.
  • the values of the entries and the number of the entries in the extended MCS table are only examples, and are not limited thereto.
  • FIG. 10 a and FIG. 10 b show two different patterns based on different positions of reserved table for retransmission.
  • eNB and UE should assume the same bitmap or selected table after the indication in order to avoid ambiguity.
  • legacy tables may be used in that cases.
  • eNB generally uses DCI format 1A for downlink transmission. So the legacy MCS table may be used as default setting in DCI format 1A transmission.
  • the extended MCS table may only be used for DCI format 2C or future formats.
  • bitmaps in FIGS. 10 a and 10 b are only examples, and those skilled in the art can configure the MCS table with different bitmaps according to the communication scenario.
  • the communication method according to the first embodiment of the present disclosure has been described above. According to the communication method, more entries corresponding to more modulation orders/coding rates than those in the legacy tables may be indicated by the bitmap. Thereby, higher modulation orders may be supported to adapt channel and improve spectral efficiency, and certain coding rates and modulation orders may be selected flexibly according to different communication scenarios, thus achieving the best performance.
  • bitmap indication may be transmitted by eNode B to UE via an upper layer signaling, such as the RRC signaling, the signaling overhead in the physical layer may be kept unchanged.
  • the number of entries in the sub-table may be the same as that in the legacy parameter table, so that a good backward compatibility may be ensured and only a small modification to the standard is needed.
  • the communication apparatus may be a base station (which may also be referred to as eNode B or eNB) or a user equipment (UE), and locates in a wireless communication system comprising both the base station and the UE.
  • eNode B eNode B
  • UE user equipment
  • FIG. 11 schematically shows the configuration of a base station according to the first embodiment of the present disclosure.
  • the base station 1100 according to the first embodiment is used to configure a parameter table.
  • the base station 1100 mainly comprises a storing unit 1101 and a transmitting unit 1102 .
  • Other parts of the base station 1100 not closely related to the technical solution of the first embodiment of the disclosure are not shown in the figure to avoid the ambiguity of the subject matter.
  • the storing unit 1101 is configured to store a pre-defined parameter table.
  • the parameter table may be a CQI table, a differential CQI table or a MCS table.
  • the parameter table may include the whole entries of a legacy parameter table and some extended entries.
  • the transmitting unit is configured to transmit to the UE a bitmap indication which indicates a sub-table selected from the pre-defined parameter table.
  • the bitmap indication may be transmitted by the eNode B to the UE via a signaling in the upper layer explicitly or in the physical layer implicitly.
  • the bitmap indication may be transmitted directly via UE-specific RRC signaling semi-statically or implicitly triggered via bits in DCI format dynamically (specific configurations are via RRC signaling).
  • the bitmap indication may be used for indicating the sub-table selected from the parameter table. It should be noted that the number of the entries in the sub-table may be the same as in the legacy parameter table, so that the signaling overhead related to the indication in the physical layer may be kept unchanged.
  • the base station 1100 may further comprise a generating unit (not shown).
  • the generating unit is configured to generate the bitmap indication based on wireless link conditions of the user equipment in the communication system. For example, when the user equipment is at a position close to cell center, when a carrier for a secondary cell is assigned for the user equipment, or when the user equipment is in a uplink transmission, the generating unit generates the bitmap indication which indicates a sub-table including more extended entries. When the user equipment is at a position far away from cell center, when a carrier for a primary cell is assigned for the user equipment, or when the user equipment is in a downlink transmission, the generating unit generates the bitmap indication which indicates a sub-table including more legacy entries.
  • bitmap indication can be generated by the generating unit based on communication scenarios other than those described above with reference to FIGS. 4-6 .
  • the base station 1100 may further comprise an informing unit (not shown).
  • the informing unit is configured to inform of the UE an index, such as a MCS index, of an entry based on the sub-table.
  • the base station 1100 may further comprise a re-indexing unit to re-index the entries.
  • the re-indexing unit may re-index the selected original MCS entries, so that the index length is still the same as legacy MCS table. Then, the base station 1100 may inform one of the new indices to the UE.
  • the base station 1100 may further comprise a restoring unit to restore the new indices to the original indices.
  • the restoring unit may restore the reported new index to the original CQI index based on the bitmap indication.
  • FIG. 12 shows schematically the configuration of a user equipment according to the first embodiment of the present disclosure.
  • the user equipment 1200 according to the first embodiment is used to configure a parameter table.
  • the user equipment 1200 mainly comprises a storing unit 1201 and a receiving unit 1202 .
  • other parts of the user equipment 1200 not closely related to the technical solution of the first embodiment of the disclosure are not shown in the figure to avoid the ambiguity of the subject matter.
  • the storing unit 1201 is configured to store the pre-defined parameter table similar to that described with reference to FIG. 11 .
  • the receiving unit 1202 is configured to receive from the eNode B a bitmap indication which indicates a sub-table selected from the pre-defined parameter table.
  • the user equipment 1200 may further comprise a reporting unit (not shown).
  • the reporting unit is configured to report to the eNode B an index of an entry based on the sub-table.
  • the user equipment 1200 may further comprise a re-indexing unit to re-index the entries in the sub-table, for example, for the extended CQI table, and may further comprise a restoring unit to restore the received index to the original index, for example, for the extended MCS table.
  • a re-indexing unit to re-index the entries in the sub-table
  • a restoring unit to restore the received index to the original index, for example, for the extended MCS table.
  • the configurations and process of the re-indexing unit and the restoring unit are similar to those in the base station 1100 , and are not described here to avoid redundancy.
  • the communication apparatuses according to the first embodiment of the present disclosure have been described above. According to the communication apparatuses, higher modulation orders may be supported flexibly, while the signaling overhead in the physical layer may be kept unchanged, thus achieving a good backward compatibility.
  • FIG. 13 is a flowchart showing an exemplary implementation of the communication method according to the second embodiment of the present disclosure.
  • the communication method starts at step 1301 , where multiple parameter tables are defined at both the eNode B and the user equipment.
  • the parameter may be various communication parameters such as CQI, differential CQI and/or MCS, as described above.
  • the parameter table may be a CQI table, a differential CQI table and/or a MCS table.
  • the parameter table may include at least a legacy parameter table and an aggressive parameter table which includes new modulation order related entries or new combinations of modulation order and coding rate related entries, which are shown in FIG. 14 schematically.
  • the legacy parameter table 1401 as shown in FIG. 14 may be a table defined in standards such as 3GPP TS 36.213, and it may correspond to communication scenarios where relatively conservative modulation orders/coding rates are required.
  • the aggressive parameter table 1402 as shown in FIG. 14 may be an extended new table, and it may correspond to communication scenarios where relatively aggressive modulation orders/coding rates are required.
  • eNode B transmits to UE an indication which indicates a parameter table selected from the parameter tables.
  • the indication may be a bit indication or a bitmap indication, and it may be transmitted by eNode B to UE via a signaling in an upper layer than the physical layer.
  • the bitmap indication may be transmitted via RRC signaling or bits in DCI format.
  • the number of entries in any one of the multiple parameter table may be the same as in the legacy parameter table, so that the signaling overhead related to the indication in the physical layer may be kept unchanged.
  • the indication may be generated by the eNode B based on the communication scenario of the wireless communication system.
  • the multiple parameter tables may be hard-coded tables, that is, pre-defined tables in standard and the content is unchangeable. All possible tables may be specified in standard, and the eNode B will indicate the UE which table would be used for certain period semi-statically via RRC or dynamically via bits in DCI.
  • CQI and MCS related tables could have different configurations. There is no need for CQI and MCS to always follow the same modulation order restriction. Differential CQI tables could also have different hard-coded versions and eNB indicates which tables would be used via RRC or bits in DCI format. There is another possibility that RRC signaling is used for configuration/restriction and DCI bits for triggering. For example, multiple hard-coded tables are pre-defined in standards and the RRC signaling is used to indicate which tables would be used for current configuration, then the specific table will be dynamically triggered in each transmission time interval (TTI) via bits in DCI.
  • TTI transmission time interval
  • the communication apparatus may be a base station (which is also referred to as eNode B) or a user equipment (UE), and locates in a wireless communication system comprising both the base station and the UE.
  • eNode B which is also referred to as eNode B
  • UE user equipment
  • FIG. 15 shows schematically the configuration of a base station according to the second embodiment of the present disclosure.
  • the base station 1500 according to the second embodiment mainly comprises a storing unit 1501 and a transmitting unit 1502 .
  • the storing unit 1501 is configured to store multiple pre-defined parameter tables including at least a legacy parameter table and an aggressive parameter table which includes new modulation order related entries or new combinations of modulation order and coding rate related entries as described above.
  • the transmitting unit 1502 is configured to transmit to the user equipment an indication which indicates a pre-defined parameter table selected from the multiple pre-defined parameter tables.
  • the number of the entries in the selected pre-defined parameter sub-table may be the same as in the legacy parameter table, so that the signaling overhead related to the indication in the physical layer may be kept unchanged.
  • the other parts of the base station 1500 and the functions thereof are similar to those of the base station 1100 according to the first embodiment of the present disclosure, and will not be described here to avoid redundancy.
  • FIG. 16 shows schematically the configuration of a user equipment according to the second embodiment of the present disclosure.
  • the user equipment 1600 according to the second embodiment mainly comprises a storing unit 1601 and a receiving unit 1602 .
  • the storing unit 1601 is configured to store multiple pre-defined parameter tables similar to that described with reference to FIG. 15 .
  • the receiving unit 1602 is configured to receive from the eNode B an indication which indicates a parameter table selected from the multiple pre-defined parameter tables.
  • the other parts of the user equipment 1600 and the functions thereof are similar to those of the user equipment 1200 according to the first embodiment of the present disclosure, and will not be described here to avoid redundancy.
  • the communication apparatuses according to the second embodiment of the present disclosure have been described above. With the communication apparatuses according to the second embodiment of the present disclosure, higher modulation orders may be supported flexibly, while the signaling overhead in the physical layer may be kept unchanged, thus achieving a good backward compatibility.
  • FIG. 17 is a flowchart showing an exemplary implementation of the communication method according to the third embodiment of the present disclosure.
  • the communication method starts at step 1701 , where a parameter table similar to that in the first embodiment is defined at both the eNode B and the user equipment.
  • the eNode B transmits to the UE an indication which indicates one entry of the parameter table by legacy bits and at least one unused bit jointly.
  • the third embodiment according to the present disclosure focuses on using unused bits combining with current bits, for example, MCS bits in DCI, to indicate the extended parameter table, for example, the extended MCS table.
  • MCS indication there is 5 bits for MCS indication in DCI format currently. Therefore, in order to indicate the extended MCS table and not impact on the current MCS bits, one option is to combine 1 bit or 2 bit of Carrier Indicator Field (CIF) with MCS bits to jointly indicate extended table (considering the typical scenario of CA is 2 CC in downlink and 1 in uplink so 1 bit is enough for the indication of carrier index and thus 2 bits are redundant, which may be used to jointly indicate MCS).
  • CIF Carrier Indicator Field
  • Hybrid Automatic Repeat Request (HARQ) ID Another option is to combine unused bit in Hybrid Automatic Repeat Request (HARQ) ID with MCS bits to jointly indicate extended MCS table.
  • HARQ ID is pure implementation related issue in eNB. For example, only first two bits are used for indication of normal HARQ process ID so the last 1 bit could be used for other business. In this case, the eNB has flexibility to use the last bit in HARQ ID to jointly indicate MCS.
  • any other solutions to jointly combine unused bits with current 5 bits of MCS to indicate extended table are also applied.
  • Which redundant bits will be used finally may be configured by UE specific RRC in the eNB.
  • the base station mainly comprises a storing unit and a transmitting unit.
  • the storing unit is configured to store a pre-defined parameter table including the whole entries of a legacy parameter table and extended entries as described above.
  • the transmitting unit is configured to transmit to the user equipment an indication which indicates one entry of the pre-defined parameter table by legacy bits and at least one unused bit jointly, so that the signaling overhead related to the indication in the physical layer is kept unchanged.
  • the other parts of the base station and the functions thereof are similar to those of the base station 1100 according to the first embodiment of the present disclosure, and will not be described here to avoid redundancy.
  • the user equipment mainly comprises a storing unit and a receiving unit.
  • the storing unit is configured to store a pre-defined parameter table including the whole entries of a legacy parameter table and extended entries as described above.
  • the receiving unit is configured to receive from the eNode B an indication which indicates one entry of the pre-defined parameter table by legacy bits and at least one unused bit jointly.
  • the other parts of the user equipment and the functions thereof are similar to those of the user equipment 1200 according to the first embodiment of the present disclosure, and will not be described here to avoid redundancy.
  • FIG. 18 is a flowchart showing an exemplary implementation of the communication method according to the fourth embodiment of the present disclosure.
  • the communication method starts at step 1801 , where a parameter table similar to that in the first embodiment is defined at both the eNode B and the user equipment.
  • the eNode B transmits to the UE an indication which indicates one entry of the parameter table by a number of bits, wherein the number of bits corresponds to the number of entries in the parameter table.
  • the fourth embodiment according to the present disclosure focuses on extending the MCS bits directly in DCI format and defining a new transmission mode in standards, such as RAN1 standard.
  • the new transmission mode may be Mode 9+ as shown in FIG. 19 , wherein the modification of DCI format 2C to DCI format 2C+ is intended to extend the MCS bits from 5 to 6 or even bigger.
  • the transmitting unit of the base station according to the fourth embodiment may be configured to transmit to the user equipment an indication which indicates one entry of the predefined parameter table by a number of bits, wherein the number of bits corresponds to the number of entries in the parameter table.
  • the receiving unit of the user equipment according to the fourth embodiment may be configured to receive from the eNode B an indication which indicates one entry of the predefined parameter table by a number of bits, wherein the number of bits corresponds to the number of entries in the parameter table.
  • the other parts of the base station and the user equipment and the functions thereof are similar to those of the base station 1100 and the user equipment 1200 according to the first embodiment of the present disclosure, and will not be described here to avoid redundancy.
  • the embodiments of the present disclosure may be implemented by hardware, software and firmware or in a combination thereof, and the way of implementation does not limit the scope of the present disclosure.
  • connection relationships between the respective functional elements (units) in the embodiments of the disclosure do not limit the scope of the present disclosure, in which one or multiple functional element(s) or unit(s) may contain or be connected to any other functional elements.

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